ball mills alkynes
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- ball mills alkynes
A new, ligand- and solvent-free method for the Huisgen 1,3-dipolar cycloaddition (click reaction) was developed using a planetary ball mill. Besides various alkynes and azides, a propargyl functionalized polymer was converted by mill clicking. Moreover, it was possible to carry out a clickpolymerization in a
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Mechanochemical Glaser coupling (homo-coupling of terminal alkynes) was investigated in depth by Stolle et al. in the subsequent report [16]. Initial studies were carried with phenylacetylene (Scheme 2.19). The reactions were carried out in a ball mill by using zirconia (ZrO 2) as the material for the
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Mechanochemical indole synthesis by rhodium-catalysed oxidative coupling of acetanilides and alkynes under solventless conditions in a ball mill G. N. Hermann, C. L. Jung and C. Bolm, Green Chem., 2017, 19, 2520 DOI: 10.1039/C7GC00499K
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This contribution presents two solvent-free reactions of terminal alkynes in ball mills: Pd-catalyzed Sonogashira cross-coupling and Cu-catalyzed homo-coupling (Glaser reaction). The results are compared to other solvent-free reaction protocols, which have been published up to date for those types of reactions. Reactions are assessed on the basis of reaction variables like type of catalyst and ...
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Organic chemistry is the study of carbon compounds, so the study of organic chemistry is important because all living things are based on carbon compounds. Carbon is unique in that it can form up to four bonds in a compound, so they can easily bond with other …
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2.2. Indole Synthesis. Zille et al. [] reported a good Sonogashira reaction method under solvent free conditions involving the reaction of o-iodoaniline and terminal alkynes using ZnBr 2 as catalyst to afford 2-alkynylanilines in a planetary ball mill at 800 rpm for 30 min ().Rhodium (III)-catalyzed oxidative cyclization of acetanilides and non-terminal alkynes using dioxygen as a oxidant in ...
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In presence of a catalytic amount of Pd(PPh 3) 4 and copper iodide, the mechanochemical Sonogashira reaction between terminal alkynes and aryl halides bearing various substituents proceeded smoothly in a high-speed ball mill . 20 Unlike solution-based reactions, the reactions were unsuccessful when Pd(OAc) 2 or Pd(PPh 3) 2 Cl 2 was employed as ...
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Source: "Methane-CRC-MW-3D-balls" by Ben Mills is in the public domain. To make four covalent bonds, the C atom bonds to four H atoms, making the molecular formula for methane CH 4 . The two-dimensional diagram for methane is misleading, however; the four covalent bonds that the C atom makes are oriented three-dimensionally toward the ...
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The omission of solvents or the reduction of solvent intensity in chemical reactions is one of myriad possibilities to decrease the E- or Sheldon-factor for chemical syntheses and thus improve the "greenness" of a chemical process [1]. It is generally understood that reactions performed in the absen…
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Hydroamination Reactions of Alkynes with ortho‐Substituted Anilines in Ball Mills: Synthesis of Benzannulated N‐Heterocycles by a Cascade Reaction Maik Weiße Institute for Technical Chemistry and Environmental Chemistry, Friedrich Schiller University …
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The Drum Mill TM 500 is a laboratory ball mill designed to grind large sample volumes up to 35 l. It keeps initial feed sizes of max. 20 mm and can RETSCH drum mills are true allrounders. They homogenize, for example: activated carbon, alloys, bentonite, bones ...
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A method for the Glaser coupling reaction of alkynes by using a vibration ball mill has been developed. The procedure avoids the use of ligands and solvents during the reaction. Aryl- and alkyl-substituted terminal alkynes undergo homocoupling if coground with KF-Al(2)O(3) and CuI as a milling auxiliary and catalyst. Furthermore, an alternative protocol has been developed incorporating 1,4 ...
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2.2. Indole Synthesis. Zille et al. [] reported a good Sonogashira reaction method under solvent free conditions involving the reaction of o-iodoaniline and terminal alkynes using ZnBr 2 as catalyst to afford 2-alkynylanilines in a planetary ball mill at 800 rpm for 30 min ().Rhodium (III)-catalyzed oxidative cyclization of acetanilides and non-terminal alkynes using dioxygen as a oxidant in ...
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In fact we design, build and install ball mills which are specially adapted to grind hard and even extremely abrasive materials. Advantages of the ball mill . Adjustable grain size distribution . When operating on the open circuit principle, the product fineness and grain size distribution are adjusted via the peripheral material discharge. In ...
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Hydroamination Reactions of Alkynes with ortho-Substituted Anilines in Ball Mills: Synthesis of Benzannulated N-Heterocycles by a Cascade Reaction Maik Weiße, Institute for Technical Chemistry and Environmental Chemistry, Friedrich Schiller University …
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A method for the Glaser coupling reaction of alkynes by using a vibration ball mill has been developed. The procedure avoids the use of ligands and solvents during the reaction. Aryl‐ and alkyl‐substituted...
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A method for the Glaser coupling reaction of alkynes by using a vibration ball mill has been developed. The procedure avoids the use of ligands and solvents during the reaction. Aryl- and alkyl-substituted terminal alkynes undergo homocoupling if coground with KF–Al 2 O 3 and CuI as a milling auxiliary and catalyst.
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A method for the Glaser coupling reaction of alkynes by using a vibration ball mill has been developed. The procedure avoids the use of ligands and solvents during the reaction. Aryl- and alkyl-substituted terminal alkynes undergo homocoupling if coground with KF-Al(2)O(3) and CuI as a milling auxil …
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To overcome this limitation, a mixer/shaker mill or a planetary mill 1 has been developed and these devices provide much higher energy and are more reliable than hand grinding. Mixing in such a mill is generally referred to as "milling". Mechanical grinding in these …
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ment, the ball and vessel were weighted and no significant change in weight, nor adepreciation of the yield over time was noticed. They therefore concludethat the co-catalysis is indeed happening on the surface of the reaction vial. The Jiang group, while working on cross-dehydrogenative-coupling reactions with alkynes (Figure 1B), came across the
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Request PDF | Solvent-free reactions of alkynes in ball mills: It is definitely more than mixing | This contribution presents two solvent-free reactions of terminal alkynes in ball mills: Pd ...
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Solvent-free reactions of alkynes in ball mills: It is definitely more than mixing. We need to talk: The case for a multidisciplinary approach to designing green policy. A database tool for process chemists and chemical engineers to gauge the material and synthetic efficiencies of synthesis plans to industrially important targets.
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Ball Mills afforded some precautions since azides are in general shock-sensitive materials. However, phlegmatization of the reaction mixture with quartz sand as milling auxiliary provides the respective 1,4substituted 1,2,3- -triazoles in yields ranging from 80 to 98% [7].
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Read "Hydroamination Reactions of Alkynes with ortho‐Substituted Anilines in Ball Mills: Synthesis of Benzannulated N‐Heterocycles by a Cascade Reaction, Chemistry - A European Journal" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
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Aerobic oxidation of thiols to disulfides under ball-milling in the absence of any catalyst, solvent, or base Chatterjee, Tanmay; Ranu, Brindaban C. RSC Advances ( 2013 ), 3 ( 27 ), 10680-10686 CODEN: RSCACL ; ISSN: 2046-2069 .
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Reactions in a planetary ball mill were carried out with the use of a model 'RETSCH PM 100 (Retsch , 42781 Haan, Retsch-Alle 1-5, Germany) instrument with a stainless steel jar (12.5 mL) and ...
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ChemInform Abstract: Hydroamination Reactions of Alkynes with ortho‐Substituted Anilines in Ball Mills: Synthesis of Benzannulated N‐Heterocycles by a Cascade Reaction.
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